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By Jon Copley WILD dolphins do impressions, mimicking the whistles of their pod mates. But rather than just being a party trick, the ability may be a crucial early step in the development of language. Vincent Janik, now at the Woods Hole Oceanographic Institution in Massachusetts, used hydrophones to listen to bottlenose dolphins in the Moray Firth, north-east Scotland. The difference in the time a sound takes to travel to each of a pair of hydrophones depends on where the sound is coming from. By comparing these differences across 3 pairs of hydrophones,